/* Lesson typography and layout; shared colors and navigation come from home.css. */
.home.lesson-page .lesson{max-width:920px;padding:24px 40px 0}
.lesson-page .back{color:#a1513e;font-size:var(--font-ui)}
.lesson-page .lesson-heading{display:grid;grid-template-columns:minmax(0,1fr) 240px;align-items:center;gap:32px;margin:24px 0 18px}
.lesson-page .lesson-heading .eyebrow{color:#976045;font-size:var(--font-ui);letter-spacing:.05em;margin:0 0 10px}
.home.lesson-page .lesson-heading h1{font-size:30px;line-height:1.6;letter-spacing:.005em}
.lesson-page .lesson-art{margin:0;overflow:hidden;border-radius:10px;background:#f6eee1}
.lesson-page .lesson-art img{display:block;width:100%;height:auto;aspect-ratio:3/2;object-fit:cover}
.lesson-page .lesson-preview-note{font-size:var(--font-ui);line-height:1.8;color:var(--muted);margin:0 0 28px}
.lesson-page .prose{background:#fff;border:1px solid #e1e3dd;border-radius:12px;padding:38px 44px;font-size:17px;line-height:2;color:var(--body);box-shadow:0 3px 12px #28382405;overflow-wrap:anywhere}
.lesson-page .prose p{margin-bottom:1.6em}
.lesson-page .prose p:last-child{margin-bottom:0}
.lesson-page .prose h2{font-size:24px;line-height:1.7;margin:48px 0 26px;padding-top:30px;border-top:1px solid #e6e7e3;color:var(--ink)}
.lesson-page .prose h3{font-size:20px;line-height:1.8;margin:36px 0 20px;color:var(--ink)}
.lesson-page .lesson-end{padding:28px 0 40px;font-size:var(--font-ui);color:var(--muted)}
.lesson-page .primary{background:#ad5b43;border-color:#ad5b43;border-radius:6px}
.lesson-page .primary:hover{background:#934a36;border-color:#934a36}
@media(max-width:600px){
 .home.lesson-page .lesson{padding:20px 20px 0}
 .lesson-page .lesson-heading{grid-template-columns:minmax(0,1fr);gap:18px;margin:22px 0 14px}
 .home.lesson-page .lesson-heading h1{font-size:26px}
 .lesson-page .lesson-art{width:100%;max-width:300px}
 .lesson-page .lesson-preview-note{margin-bottom:22px}
 .lesson-page .prose{padding:26px 21px;font-size:16px;line-height:2}
 .lesson-page .prose h2{font-size:21px;margin-top:36px;padding-top:26px}
 .lesson-page .prose h3{font-size:18px}
}

/* Full introduction: navigation, supporting diagrams and chapter-level reading state. */
.lesson-page .lesson-toc{padding:24px 28px;margin:0 0 28px;background:#fff;border:1px solid var(--line);border-radius:12px}
.lesson-page .lesson-toc h2{font-size:var(--font-small-heading);margin:0 0 14px;line-height:1.7}
.lesson-page .lesson-toc ol{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.lesson-page .lesson-toc a{display:block;color:#a1513e;line-height:1.8;padding:8px 0;font-size:var(--font-ui);text-decoration:underline;text-underline-offset:4px}
.lesson-page .prose a{color:#a1513e;text-decoration:underline;text-underline-offset:4px;overflow-wrap:anywhere}
.lesson-page .prose ul,.lesson-page .prose ol{padding-left:1.5em;margin:0 0 1.6em}
.lesson-page .prose li+li{margin-top:.65em}
.lesson-page .prose code{font-size:inherit;background:#f4f0e9;border-radius:4px;padding:1px 5px;white-space:normal;overflow-wrap:anywhere}
.lesson-page .prose .publishing-flow{list-style:none;counter-reset:flow;padding:0;margin:24px 0 36px;display:grid;gap:10px}
.lesson-page .publishing-flow li{counter-increment:flow;margin:0;padding:15px 18px 15px 58px;position:relative;border-left:3px solid #c77d55;background:#fcf3ea;border-radius:0 7px 7px 0;line-height:1.8}
.lesson-page .publishing-flow li:before{content:counter(flow);position:absolute;left:17px;top:16px;font-size:var(--font-ui);color:#976045;font-weight:700}
.lesson-page .prompt-box{border:1px solid #dfd8cb;background:#fcfaf5;border-radius:9px;margin:0 0 32px;overflow:hidden}
.lesson-page .prompt-toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding:16px 20px;border-bottom:1px solid #e6dfd3;font-size:var(--font-ui)}
.lesson-page .copy-button{font-size:var(--font-ui);background:#fff;border:1px solid #ad5b43;border-radius:6px;color:#a1513e;padding:10px 14px;line-height:1.7}
.lesson-page .prompt-box pre{white-space:pre-wrap;overflow-wrap:anywhere;font:inherit;line-height:1.9;padding:20px;margin:0}
.lesson-page .copy-status{font-size:var(--font-ui);padding:0 20px;margin:0 0 16px}
.lesson-page .copy-status:empty{display:none}
.lesson-page .video-pending{border:1px dashed #c6bba8;border-radius:9px;padding:22px;margin:28px 0;background:#f8f5ef}
.lesson-page .video-pending .media-status{font-size:var(--font-ui);color:#976045;font-weight:600;margin:0 0 10px}
.lesson-page .prose .video-pending h3{margin:0 0 12px;font-size:var(--font-small-heading)}
.lesson-page .reading-anchor{display:block;position:relative;top:-24px}
.lesson-page .chapter-recap{background:#fff;border:1px solid var(--line);border-radius:12px;margin:28px 0 0;padding:22px 28px;font-size:var(--font-body);line-height:1.9}
.lesson-page .chapter-recap summary{font-size:var(--font-small-heading);font-weight:600;color:var(--ink);cursor:pointer}
.lesson-page .chapter-recap h3{font-size:var(--font-small-heading);line-height:1.7;margin:26px 0 14px}
.lesson-page .chapter-recap ul{padding-left:1.3em;margin:0}
.lesson-page .chapter-recap li+li{margin-top:10px}
.lesson-page .lesson-end h2{font-size:var(--font-section);color:var(--ink);line-height:1.7;margin:0 0 16px}
.lesson-page #completion-status{margin:14px 0;color:#976045}
.lesson-page #completion-status:empty{display:none}
.lesson-page .lesson-next{margin-top:28px;padding-top:24px;border-top:1px solid var(--line)}
@media(max-width:600px){
 .lesson-page .lesson-toc,.lesson-page .chapter-recap{padding:20px 18px}
 .lesson-page .publishing-flow li{padding-left:48px}
 .lesson-page .publishing-flow li:before{left:14px}
 .lesson-page .video-pending{padding:18px}
 .lesson-page .prompt-toolbar,.lesson-page .prompt-box pre{padding:16px}
}

/* Optional chapter-end understanding checks. No navigation gate. */
.lesson-page .chapter-recap ul{list-style:none;padding:0}
.lesson-page .recap-item{display:flex;align-items:flex-start;gap:12px;cursor:pointer;min-height:44px;padding:6px 0}
.lesson-page .recap-item input{appearance:auto;flex:0 0 22px;width:22px;height:22px;margin:6px 0 0;accent-color:#ad5b43;cursor:pointer}
.lesson-page .recap-item input:focus-visible{outline:3px solid #98701c;outline-offset:4px}
.lesson-page .recap-item span{min-width:0;overflow-wrap:anywhere}
.lesson-page .recap-note,.lesson-page .recap-status{font-size:var(--font-ui);line-height:1.8;margin:16px 0 0}

/* Interior illustration and responsive, selectable-text diagrams. */
.lesson-page .prose .lesson-illustration{margin:34px 0 42px}
.lesson-page .lesson-illustration img{display:block;width:100%;height:auto;border-radius:10px}
.lesson-page .lesson-illustration figcaption{font-size:var(--font-ui);line-height:1.8;color:var(--body);margin-top:12px;text-align:center}
.lesson-page .prose .lesson-diagram{margin:32px 0 40px;padding:26px 22px;background:#faf7f1;border:1px solid #e4dace;border-radius:12px}
.lesson-page .lesson-diagram figcaption{font-size:var(--font-small-heading);font-weight:650;color:var(--ink);line-height:1.7;margin-bottom:24px}
.lesson-page .publishing-map{display:grid;grid-template-columns:minmax(0,1fr) 24px minmax(0,1fr) 24px minmax(0,1.15fr);align-items:center;gap:10px;font-size:var(--font-body);line-height:1.7}
.lesson-page .map-card{padding:18px 10px;border:1px solid #d9d3c9;border-radius:8px;background:white;display:flex;flex-direction:column;align-items:center;text-align:center;gap:10px;min-width:0}
.lesson-page .map-card>span:last-child,.lesson-page .map-outputs>span{font-size:var(--font-ui)}
.lesson-page .map-service{background:#f5e3d8;border-color:#d5ae95}
.lesson-page .diagram-symbol svg{width:36px;height:36px;color:#a1513e}
.lesson-page .map-arrow{font-size:var(--font-section);color:#a1513e;text-align:center}
.lesson-page .map-outputs{display:grid;gap:10px;text-align:center;min-width:0}
.lesson-page .map-output{display:flex;align-items:center;justify-content:center;gap:8px;background:white;padding:13px 6px;border:1px solid #d9d3c9;border-radius:8px}
.lesson-page .map-output svg{width:24px;height:24px;color:#8b624c}
.lesson-page .folder-map{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;font-size:var(--font-body);line-height:1.8}
.lesson-page .folder-zone{display:flex;flex-direction:column;align-items:center;text-align:center;min-width:0;padding:24px 14px 18px;background:#fff;border:1px solid #d8d9d4;border-radius:9px}
.lesson-page .working-zone{border-color:#c9d7db;background:#f2f7f7}
.lesson-page .original-zone{border-color:#dbc8b2;background:#fffaf2}
.lesson-page .folder-zone>span:not(.folder-symbol):not(.backup-arrow){font-size:var(--font-ui)}
.lesson-page .folder-symbol{display:block;position:relative;width:68px;height:45px;background:#d8e4e7;border:2px solid #7998a0;border-radius:4px;margin:9px 0 18px}
.lesson-page .folder-symbol:before{content:"";position:absolute;left:-2px;top:-10px;width:30px;height:10px;background:inherit;border:2px solid #7998a0;border-bottom:0;border-radius:4px 4px 0 0}
.lesson-page .original-zone .folder-symbol,.lesson-page .original-zone .folder-symbol:before{background:#eed5b4;border-color:#b88651}
.lesson-page .folder-example{margin-top:16px;font-size:var(--font-ui);padding:10px 6px;border-top:1px solid #dcded9;width:100%}
.lesson-page .backup-arrow{font-size:var(--font-section);color:#976045;margin:6px 0}
.lesson-page .backup-card{display:flex;align-items:center;justify-content:center;gap:12px;background:#fff;padding:12px;border:1px dashed #b88651;border-radius:7px;width:100%;font-size:var(--font-ui)}
@media(max-width:600px){
 .lesson-page .prose .lesson-diagram{padding:22px 16px}
 .lesson-page .publishing-map{grid-template-columns:minmax(0,1fr);gap:12px}
 .lesson-page .map-card{padding:16px;gap:6px}
 .lesson-page .map-arrow{transform:rotate(90deg);line-height:1}
 .lesson-page .map-outputs{grid-template-columns:repeat(2,minmax(0,1fr))}
 .lesson-page .map-outputs>span{grid-column:1/-1}
 .lesson-page .map-output{flex-direction:column;padding:12px 8px}
 .lesson-page .folder-map{grid-template-columns:minmax(0,1fr);gap:24px}
 .lesson-page .folder-zone{padding:24px 14px 18px}
}

/* Chapter 1: examples and responsive tables; shared body type remains 18px. */
.lesson-page[data-chapter="chapter-1"] .lesson-heading{grid-template-columns:minmax(0,1fr)}
.lesson-page .prose .example-note{margin:24px 0 32px;padding:20px 24px;background:#f8f5ef;border-left:3px solid #c08a6a;border-radius:0 8px 8px 0}
.lesson-page .prose .example-note p{margin:0}
.lesson-page .lesson-table{border-collapse:collapse;width:100%;table-layout:fixed;margin:24px 0 36px;font-size:var(--font-body);line-height:1.8}
.lesson-page .lesson-table caption{text-align:left;font-size:var(--font-ui);color:var(--body);padding-bottom:12px}
.lesson-page .lesson-table th,.lesson-page .lesson-table td{border:1px solid #ddd9cf;padding:14px 16px;text-align:left;vertical-align:top;overflow-wrap:anywhere}
.lesson-page .lesson-table th{background:#f6eee4;color:var(--ink);font-weight:600}
.lesson-page .lesson-table th:first-child{width:24%}
.lesson-page .lesson-table td{background:#fff}
.lesson-page .lesson-table tr:nth-child(even) td{background:#fcfaf7}
.lesson-page .route-map{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.lesson-page .route-card{background:#fff;border:1px solid #d3dcd9;border-radius:8px;padding:22px 16px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:8px}
.lesson-page .route-card:first-child{background:#f1f6f5}
.lesson-page .route-card:last-child{background:#fff8ed;border-color:#e0cfb9}
.lesson-page .route-card h4{margin:0;font-size:var(--font-small-heading);color:var(--ink);line-height:1.7}
.lesson-page .prose .route-card p{margin:0;font-size:var(--font-body)}
.lesson-page .route-card>strong{font-size:var(--font-body)}
.lesson-page .route-arrow{font-size:var(--font-section);color:#a1513e;line-height:1.2}
.lesson-page .prose .diagram-note{font-size:var(--font-ui);line-height:1.8;margin:18px 0 0}
.lesson-page .prose .promise-parts{padding:0;margin:0;list-style:none;display:grid;gap:14px}
.lesson-page .prose .promise-parts li{margin:0;background:#fff;border:1px solid #ded6ca;border-radius:8px;padding:16px 20px}
.lesson-page .promise-parts li>span{display:block;font-size:var(--font-ui);color:#976045;margin-bottom:4px}
.lesson-page .promise-parts strong{font-size:var(--font-body);color:var(--ink)}
.lesson-page .prose .promise-parts p{margin:8px 0 0;font-size:var(--font-body)}
.lesson-page .lesson-next{display:flex;flex-direction:column;align-items:flex-start;gap:18px}
.lesson-page .chapter-next{display:inline-flex;align-items:center;gap:12px;text-decoration:none;padding:14px 20px;color:white}
@media(max-width:600px){
 .lesson-page .prose .example-note{padding:18px 16px}
 .lesson-page .route-map{grid-template-columns:minmax(0,1fr)}
 .lesson-page .lesson-table,.lesson-page .lesson-table tbody,.lesson-page .lesson-table tr,.lesson-page .lesson-table td{display:block;width:100%}
 .lesson-page .lesson-table caption{display:block}
 .lesson-page .lesson-table thead{display:none}
 .lesson-page .lesson-table tr{margin-bottom:18px;border:1px solid #ddd9cf;border-radius:8px;overflow:hidden}
 .lesson-page .lesson-table td{border:0;border-bottom:1px solid #e7e1d8;padding:14px 16px}
 .lesson-page .lesson-table td:last-child{border-bottom:0}
 .lesson-page .lesson-table td:before{content:attr(data-label);display:block;font-size:var(--font-ui);font-weight:600;color:#976045;margin-bottom:6px}
 .lesson-page .prose .promise-parts li{padding:16px}
}

.lesson-page .prose>h2:first-child{margin-top:0;padding-top:0;border-top:0}

html.lesson-document{scroll-behavior:auto}

/* Chapter 2: a reordered list, an outline with notes, and a comparison of roles. */
.lesson-page[data-chapter="chapter-2"] .lesson-heading{grid-template-columns:minmax(0,1fr)}
.lesson-page .outline-example{white-space:pre-wrap;overflow-wrap:anywhere;font:inherit;line-height:1.9;margin:24px 0 32px;padding:24px;background:#fcfaf5;border:1px solid #d9d2c5;border-radius:8px}
.lesson-page .reorder-comparison{display:grid;grid-template-columns:minmax(0,1fr) 30px minmax(0,1fr);align-items:center;gap:18px}
.lesson-page .reorder-comparison h4{font-size:var(--font-body);margin-bottom:16px}
.lesson-page .prose .reorder-list{padding:0;margin:0;list-style:none;display:grid;gap:10px}
.lesson-page .prose .reorder-list li{display:flex;align-items:center;gap:12px;background:#fff;border-bottom:1px solid #d8cfbf;min-height:66px;padding:10px 12px;margin:0;font-size:var(--font-body)}
.lesson-page .reorder-list li>span{display:inline-flex;align-items:center;justify-content:center;flex:0 0 30px;width:30px;height:30px;border-radius:50%;font-size:var(--font-ui);font-weight:600}
.lesson-page .topic-a{background:#f1dfcf;color:#754a2b}.lesson-page .topic-b{background:#dce9e0;color:#355b43}.lesson-page .topic-c{background:#e9dfe9;color:#725170}.lesson-page .topic-d{background:#dce7ed;color:#3d6175}
.lesson-page .reorder-middle{font-size:var(--font-section);text-align:center;color:#965f41}
.lesson-page .sorted{border-left:3px solid #8da895;padding-left:10px!important}
.lesson-page .published-outline{border-left:4px solid #739789;padding:16px 20px;background:#f1f6f2}
.lesson-page .outline-scope{font-size:var(--font-ui);display:block;color:#365f4d;margin-bottom:18px}
.lesson-page .outline-chapter>span,.lesson-page .outline-section>span,.lesson-page .writing-memo>span{display:block;font-size:var(--font-ui);color:#69503b;margin-bottom:4px}
.lesson-page .outline-chapter>strong,.lesson-page .outline-section>strong{font-size:var(--font-body);display:block}
.lesson-page .outline-section{border-left:2px solid #93aa9b;margin:18px 0 0 12px;padding:0 0 0 18px}
.lesson-page .writing-memo{margin:0 0 0 36px;padding:18px 22px;border-left:2px dashed #bca986;background:#fffbec}
.lesson-page .prose .writing-memo p{margin:0;font-size:var(--font-body)}
.lesson-page .prose .duplicate-diagram{background:#fff}
.lesson-page .duplicate-case{padding:18px 0}
.lesson-page .duplicate-case+.duplicate-case{border-top:1px solid #d5dacf;margin-top:8px;padding-top:26px}
.lesson-page .duplicate-case h4{font-size:var(--font-small-heading);margin-bottom:18px}
.lesson-page .meaning-pair{display:grid;grid-template-columns:minmax(0,1fr) 28px minmax(0,1fr);align-items:center;gap:14px}
.lesson-page .meaning-pair>div{border-top:3px solid #c39673;background:#f9f1e8;padding:14px}
.lesson-page .meaning-pair>div>span{display:block;font-size:var(--font-ui);margin-bottom:10px}
.lesson-page .meaning-pair>b{font-size:var(--font-section);text-align:center;color:#906343}
.lesson-page .example-case .meaning-pair>div{border-color:#8ba594;background:#edf3ef}
.lesson-page .prose .case-result{font-size:var(--font-ui);margin:16px 0 0}
@media(max-width:600px){
 .lesson-page .outline-example{padding:18px 16px}
 .lesson-page .reorder-comparison,.lesson-page .meaning-pair{grid-template-columns:minmax(0,1fr)}
 .lesson-page .reorder-middle{transform:rotate(90deg)}
 .lesson-page .published-outline{padding:16px 14px}
 .lesson-page .outline-section{margin-left:4px;padding-left:12px}
 .lesson-page .writing-memo{margin-left:20px;padding:16px}
}

/* Chapter concepts use distinct visual structures, with live text at all widths. */
.lesson-page .varied-diagram{font-size:var(--font-body);line-height:1.9}
.lesson-page .varied-diagram h4{font-size:var(--font-small-heading);line-height:1.7;margin:0;color:var(--ink)}
.lesson-page .varied-diagram strong{font-size:var(--font-body)}
.lesson-page .prose .process-diagram{background:#fff}
.lesson-page .process-lane{--lane:#946443;padding:20px 0 10px}
.lesson-page .process-lane+.process-lane{--lane:#477363;border-top:1px solid #dedbd2;margin-top:20px}
.lesson-page .process-lane h4{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.lesson-page .process-lane h4>span{background:var(--lane);color:#fff;border-radius:30px;padding:5px 16px;font-size:var(--font-ui)}
.lesson-page .prose .process-track{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));list-style:none;padding:0;margin:26px 0 0;gap:0}
.lesson-page .prose .process-track li{margin:0;padding:22px 16px 0 0;position:relative;border-top:2px solid var(--lane)}
.lesson-page .process-track li:before{content:"";width:12px;height:12px;background:var(--lane);border:3px solid #fff;border-radius:50%;position:absolute;left:0;top:-9px}
.lesson-page .process-track b{display:block;font-size:var(--font-ui);color:var(--lane);margin-bottom:6px}
.lesson-page .process-track li>span{font-size:var(--font-body)}
.lesson-page .prose .tree-diagram{background:#f5f8f5}
.lesson-page .tree-root{border-radius:50%;background:#e1ece2;border:2px solid #819e85;width:220px;min-height:90px;margin:0 auto;display:flex;align-items:center;justify-content:center;font-weight:650}
.lesson-page .prose .tree-question{text-align:center;font-size:var(--font-ui);margin:12px 0 24px}
.lesson-page .tree-forks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));position:relative;gap:36px;padding-top:28px}
.lesson-page .tree-forks:before{content:"";position:absolute;left:25%;right:25%;top:0;height:26px;border:2px solid #819e85;border-bottom:0;border-radius:14px 14px 0 0}
.lesson-page .tree-forks:after{content:"";position:absolute;left:50%;top:-24px;height:24px;border-left:2px solid #819e85}
.lesson-page .tree-branch{text-align:center;min-width:0}
.lesson-page .tree-case{font-size:var(--font-ui);color:#466450}
.lesson-page .tree-branch h4{font-size:var(--font-body);margin:8px 0 0}
.lesson-page .tree-leaf{border-top:2px solid #aec3b1;margin-top:24px;padding-top:16px}
.lesson-page .tree-leaf>span{display:block;font-size:var(--font-ui);margin-bottom:8px}
.lesson-page .tree-leaf strong{display:block;background:#e3ede1;padding:12px 8px;border-radius:40% 10% 35% 8%;color:#294e3d}
.lesson-page .prose .notebook-diagram{background:#f2eee6}
.lesson-page .spread{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;border:1px solid #d2c7b3;border-radius:3px 14px 14px 3px;box-shadow:0 5px 0 #dfd8c9;overflow:hidden}
.lesson-page .note-page{padding:24px 22px;background:#fffdf6;min-width:0}
.lesson-page .note-page+ .note-page{border-left:1px solid #d2c7b3;box-shadow:inset 10px 0 12px -12px #756d59}
.lesson-page .note-page h4{font-size:var(--font-body);border-bottom:2px solid #c9b68f;padding-bottom:10px;margin-bottom:18px}
.lesson-page .prose .note-page p{font-size:var(--font-body);margin:0 0 16px}
.lesson-page .prose .note-page p:last-child{margin:0}
.lesson-page .note-page em{font-style:normal;background:linear-gradient(transparent 60%,#f0dfb1 60%);padding-bottom:2px}
.lesson-page .note-page+ .note-page em{background:linear-gradient(transparent 60%,#d2e3dd 60%)}
.lesson-page .notebook-conclusion{margin:30px 4px 0;padding-left:18px;border-left:5px solid #a76143}
.lesson-page .notebook-conclusion>span{font-size:var(--font-ui);display:block;color:#885136;margin-bottom:6px}
.lesson-page .notebook-conclusion strong{font-size:var(--font-small-heading);font-weight:600}
.lesson-page .prose .sentence-diagram{background:#fff;border:0;border-top:3px solid #b58a57;border-bottom:1px solid #d7c4ad;border-radius:0;padding-left:8px;padding-right:8px}
.lesson-page .prose .sentence-key{list-style:none;display:flex;flex-wrap:wrap;gap:10px 22px;padding:0;margin:0 0 26px;font-size:var(--font-ui)}
.lesson-page .prose .sentence-key li{margin:0;display:flex;align-items:center;gap:8px}
.lesson-page .sentence-key span,.lesson-page .sentence-part b{display:inline-flex;align-items:center;justify-content:center;min-width:26px;height:26px;border-radius:50%;font-size:var(--font-ui);font-weight:600;background:#e5eee7;color:#31513e}
.lesson-page .sentence-key li:nth-child(2) span,.lesson-page .part-problem b{background:#f5e4cf;color:#85532f}
.lesson-page .sentence-key li:nth-child(3) span,.lesson-page .part-content b{background:#e0e9f0;color:#3f5e72}
.lesson-page .prose .assembled-sentence{font-size:var(--font-small-heading);line-height:2.5;margin:0}
.lesson-page .sentence-part{padding:2px 0;border-bottom:3px solid #a6c0aa;box-decoration-break:clone;-webkit-box-decoration-break:clone}
.lesson-page .part-problem{border-color:#d8b080}.lesson-page .part-content{border-color:#9eb9cd}
.lesson-page .sentence-part b{margin-right:6px;vertical-align:middle}
.lesson-page .prose .repair-guide{background:#fff;border-left:5px solid #bd815b;border-radius:0 12px 12px 0}
.lesson-page .prose .repair-index{list-style:none;padding:0;margin:0}
.lesson-page .prose .repair-index li{display:grid;grid-template-columns:44px minmax(0,1.2fr) minmax(0,1fr);gap:16px;align-items:start;margin:0;padding:24px 0;border-top:1px solid #ded9d0}
.lesson-page .repair-number{color:#a36646;font-size:var(--font-section);font-weight:500;line-height:1.7}
.lesson-page .repair-problem h4{font-size:var(--font-body)}
.lesson-page .prose .repair-problem p{font-size:var(--font-ui);margin:8px 0 0;line-height:1.9}
.lesson-page .repair-destination{display:flex;flex-direction:column;align-items:flex-start;gap:8px}
.lesson-page .repair-destination>span{font-size:var(--font-ui)}
.lesson-page .repair-destination a{font-size:var(--font-ui);background:#f5eee3;padding:6px 12px;border-radius:4px;border-bottom:1px solid #cdb898}
@media(max-width:600px){
 .lesson-page .prose .process-track{grid-template-columns:minmax(0,1fr);margin-left:6px}
 .lesson-page .prose .process-track li{border-top:0;border-left:2px solid var(--lane);padding:0 0 22px 24px}
 .lesson-page .process-track li:before{left:-9px;top:7px}
 .lesson-page .tree-forks{grid-template-columns:minmax(0,1fr);gap:28px;border-left:2px solid #819e85;margin:0 0 0 8px;padding:0 0 0 24px}
 .lesson-page .tree-forks:before,.lesson-page .tree-forks:after{display:none}
 .lesson-page .tree-branch{position:relative;text-align:left}
 .lesson-page .tree-branch:before{content:"";position:absolute;width:23px;left:-25px;top:15px;border-top:2px solid #819e85}
 .lesson-page .tree-leaf{margin-top:16px;padding-top:12px}
 .lesson-page .tree-leaf strong{border-radius:0 16px 16px 0;padding:12px}
 .lesson-page .spread{grid-template-columns:minmax(0,1fr)}
 .lesson-page .note-page{padding:22px 18px}
 .lesson-page .note-page+.note-page{border-left:0;border-top:1px dashed #b9ad98;box-shadow:none}
 .lesson-page .notebook-conclusion{margin-top:26px;padding-left:14px}
 .lesson-page .prose .repair-index li{grid-template-columns:32px minmax(0,1fr);gap:8px 14px}
 .lesson-page .repair-destination{grid-column:2}
}

/* Concept relationships: branch, combine, and return to the relevant lesson. */
.lesson-page .teaching-map{font-size:var(--font-body);line-height:1.9}
.lesson-page .concept-origin{max-width:340px;margin:0 auto;text-align:center;background:#efe1d3;border:1px solid #ceb49e;border-radius:8px;padding:14px 18px;font-weight:650}
.lesson-page .prose .connection-label{margin:14px 0 0;text-align:center;font-size:var(--font-ui)}
.lesson-page .reader-branches{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.lesson-page .reader-path{display:flex;flex-direction:column;gap:8px;min-width:0}
.lesson-page .concept-card{padding:18px;background:#fff;border:1px solid #ddd4c8;border-radius:8px;min-width:0}
.lesson-page .concept-label{display:block;font-size:var(--font-ui);color:#76513c;line-height:1.8;margin-bottom:8px}
.lesson-page .concept-card strong{font-size:var(--font-body);font-weight:600;color:var(--ink)}
.lesson-page .prose .concept-card p{font-size:var(--font-body);line-height:1.9;margin:8px 0 0}
.lesson-page .concept-answer{background:#edf4f1;border-color:#c3d4cb}
.lesson-page .concept-answer .concept-label{color:#395d50}
.lesson-page .concept-arrow,.lesson-page .concept-join,.lesson-page .repair-arrow{display:block;color:#92583d;font-size:var(--font-section);line-height:1.3;text-align:center}
.lesson-page .reader-path .concept-card{flex:1;text-align:center}
.lesson-page .evidence-inputs{display:grid;grid-template-columns:minmax(0,1fr) 24px minmax(0,1fr);align-items:center;gap:12px}
.lesson-page .concept-connector{display:flex;flex-direction:column;align-items:center;text-align:center;gap:8px;margin:16px 0;font-size:var(--font-ui)}
.lesson-page .repair-map{display:grid;gap:20px}
.lesson-page .repair-row{display:grid;grid-template-columns:minmax(0,1.15fr) 24px minmax(0,1fr);align-items:center;gap:12px}
@media(max-width:600px){
 .lesson-page .reader-branches,.lesson-page .evidence-inputs,.lesson-page .repair-row{grid-template-columns:minmax(0,1fr)}
 .lesson-page .reader-branches{gap:24px}
 .lesson-page .reader-path{border-left:3px solid #cbb89f;padding-left:12px;margin-top:16px}
 .lesson-page .reader-path>.concept-arrow:first-child{display:none}
 .lesson-page .concept-card{padding:16px}
 .lesson-page .repair-row+.repair-row{border-top:1px solid #dcd1c3;padding-top:22px}
 .lesson-page .repair-arrow{transform:rotate(90deg)}
}
/* 第3章：理解する対象ごとに異なる図の構造を使う */
.lesson-page[data-chapter="chapter-3"] .lesson-heading{grid-template-columns:minmax(0,1fr)}
.explanation-question{border:2px solid #6a8776;border-radius:50%;padding:22px;text-align:center;background:#f4f8f2;max-width:440px;margin:auto}
.explanation-paths{display:grid;grid-template-columns:1fr 1fr;gap:26px;margin-top:28px}
.explanation-paths section{border-top:3px solid #bba276;padding-top:16px}.explanation-paths section+section{border-color:#709083}
.lesson-page .explanation-paths p{margin:12px 0}.explanation-paths a{font-size:16px}
.material-trays{display:grid;grid-template-columns:1fr 1fr 1fr;gap:18px}
.material-trays section{padding:18px 14px;border-bottom:5px solid #749280;background:#edf3ef;border-radius:6px 6px 0 0}
.material-trays section:nth-child(2){background:#eef1f5;border-color:#8c9eaf}.material-trays section:nth-child(3){background:#faf2df;border-color:#bc9850}
.lesson-page .material-trays h4{font-size:18px}.lesson-page .material-trays p{margin:14px 0}.lesson-page .material-trays strong{font-size:16px}
.lesson-page .specific-diagram{background:#faf8f3}.vague-sentence{border-left:3px solid #aaa;padding:12px 20px;background:white}
.vague-sentence>span,.clear-sentence>span{font-size:16px;color:#5d625e}.lesson-page .specific-diagram p{margin:8px 0 0}
.clarifying-notes{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:22px 0;padding:0 8px}
.clarifying-notes span{font-size:16px;color:#74592f}.clarifying-notes b{display:block;color:#343d37;font-weight:600;border-bottom:2px solid #cebc8c;padding-bottom:8px}
.clear-sentence{background:#f0f5ed;border-left:3px solid #73917c;padding:12px 20px}.clear-sentence mark{background:#deebd5;color:inherit;padding:2px}
.save-folders{display:grid;grid-template-columns:1fr 1fr;gap:24px}.folder-tab{background:#75907e;color:white;border-radius:9px 9px 0 0;width:fit-content;padding:8px 20px;font-size:18px}
.folder-sheet{background:#f3f7f0;border:1px solid #b0c0af;padding:22px 18px;border-radius:0 8px 8px 8px}.save-folders section+section .folder-tab{background:#967e5c}.save-folders section+section .folder-sheet{background:#fcf8ee;border-color:#d2c2a4}.lesson-page .folder-sheet p{margin:16px 0 0}
.lesson-page .restart-diagram{background:#f9faf7}.lesson-page .restart-list{list-style:none;margin:0;padding:0}.lesson-page .restart-list li{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:24px;margin:0;padding:20px 0;border-bottom:1px solid #d1dbd0}.restart-list li:first-child{border-top:1px solid #d1dbd0}.restart-list a{display:block}.restart-list b{display:inline-block;background:#e2eadc;border-radius:50%;padding:10px;margin-right:8px}
.book-strip{display:flex;align-items:stretch;gap:6px;padding:14px 0 28px;border-bottom:2px solid #b3bcae}.book-strip>div{background:#e8eee1;padding:22px 14px;writing-mode:vertical-rl;text-align:center;letter-spacing:3px}.book-strip .book-main{writing-mode:horizontal-tb;flex:1;background:#f4f6ef;letter-spacing:0;display:flex;flex-direction:column;justify-content:center;gap:12px}.book-main span{font-size:16px}.promise-match{text-align:center;padding-top:24px}.lesson-page .promise-match p{margin:8px 0}
@media(max-width:600px){.explanation-question{border-radius:30px;padding:16px}.explanation-paths,.material-trays,.save-folders{grid-template-columns:1fr;gap:20px}.clarifying-notes{grid-template-columns:1fr;gap:14px}.clarifying-notes span{display:flex;justify-content:space-between;gap:12px}.clarifying-notes b{padding-bottom:3px}.lesson-page .restart-list li{grid-template-columns:1fr;gap:12px}.book-strip>div{padding:18px 8px}.book-strip .book-main{padding:16px 10px}.vague-sentence,.clear-sentence{padding:12px 14px}}
/* Draw relationships and objects; use a separate layout for narrow screens. */
.lesson-page .prose .drawn-diagram{background:#fff;border:0;border-top:2px solid #c8b99f;border-bottom:1px solid #d8d6cd;border-radius:0;padding:26px 8px 22px}
.drawn-diagram svg{display:block;width:100%;height:auto;overflow:visible;font-family:inherit;line-height:1.5}
.lesson-page .drawn-diagram figcaption{margin:0 0 28px}
.lesson-page .drawn-diagram .diagram-note{margin:20px 0 0;border-left:3px solid #b5c5b5;padding:0 0 0 16px;font-size:18px;line-height:1.9}
.drawn-diagram .diagram-mobile{display:none}
@media(max-width:600px){.drawn-diagram .diagram-desktop{display:none}.drawn-diagram .diagram-mobile{display:block}.lesson-page .prose .drawn-diagram{padding:22px 0}.lesson-page .drawn-diagram .diagram-note{font-size:18px;padding-left:12px}}
/* Generated educational artwork: no HTML or SVG diagram shapes. */
.lesson-page .prose .generated-diagram{padding:24px 0 18px;background:#fff;border:0;border-top:1px solid #d8d3c7;border-bottom:1px solid #d8d3c7;border-radius:0;margin:38px 0 46px}
.lesson-page .generated-diagram figcaption{margin:0 0 20px;font-size:var(--font-small-heading);line-height:1.7}
.generated-diagram .diagram-image-link{display:block;border:0;text-decoration:none;cursor:zoom-in}
.generated-diagram img{display:block;width:100%;height:auto;border-radius:4px}
.lesson-page .generated-diagram .diagram-image-hint{font-size:var(--font-ui);margin:8px 0 0;text-align:right}
.diagram-related{display:flex;flex-wrap:wrap;gap:8px 18px;padding:18px 0 0;font-size:var(--font-ui);line-height:1.8}
@media(max-width:600px){.lesson-page .prose .generated-diagram{padding:20px 0 16px;margin:32px -8px 38px}.lesson-page .generated-diagram figcaption,.lesson-page .generated-diagram .diagram-image-hint,.diagram-related{margin-left:8px;margin-right:8px}}